If giant X-ray flares churn circumstellar disks enough to keep ne

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If giant X-ray flares churn circumstellar disks enough to keep newborn planets, such as Earth once was, from spiraling into their suns, it would be an ironic twist on our conception of X-ray flares as _____.

A、dangerous
B、predictable
C、ancient
D、ephemeral
E、perilous
F、foreseeable

答案：A,E

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